Improvement in rock-drills



@M @VM WWW/JWM PATENTED DEC 20 1870.

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,mi @titte CHARLES PECK, CE NEW HAVEN, CONNECTICUT, AssieNoa To HntsELrAND MILO PEOK,

or SAME PLACE.

Letters Patent No. 110,280, dated December 20, 1870.

IMPROVEMENT IN RQCK-DRILLS.

The Schedine referred to in these Letters Patent and making part ormesame.

known as rock-drills, and consists in certain novel ar rangements andcombinations ot' parts, the purposes of which will be fully set forthand A described hereafter.

Description of the Drawing.

Figure 1 is a frontA elevation of my machine. Figures 2 3, and 4 areparts in detail.

General Description.

The frame proper consistsl of the upright A and bracket D, secured tothe bed-plate R, and provided with guides c a, in which the sides B Bofthe drillframe slide The horizontal bars G0 of the drill-frame supportand furnish bearings for the drill E, the screw-shaft F, and rod G, andare secured to the sides B B, within which they slide.

The screw F works in a nut secured in the bracket D, and is held at bothends inthe bearings g q in the drill-frame, so that, as the screw isturned, the drillframe is raised or lowered.

' The upper end of this screw-shaft has'a collar, K, secured to it bythe'set-screwk, and immediately below this lcollar is asleevc, S, ofwhich the disk M and earn O are a part.

The collar L is secured to this sleeve, and is p'rovided with arecess,o, into which the pin e in the npper collar K is pressed bythe spring f,so that, as the sleeve revolves, the shaft will turn with it.

Upon the upper face of the disk M there is pivoted a pawl, d, which ispressed against the collar upon the under sidefot' the bevel-gear P,andinto itsdepression h hy the spring e.

The rod Grl is held up bythe curred end Lof the trip-lever I, so thatits' upper end presses against that part of the pawl which projectsbeyond the disk M, and holds itout ol' Contact with the bevel-wheel.This position of the disl; M and rod G is shown in fig. 1.

At the lower end of the drill E a shoulder, m, is formed, by a portionof the stock being turned smaller than therest, and against this smallerpart the triplerer is held by the spring a. When it is in this positionthe end t of the lever is held under the rod G,

As the drill penetrates deeper into the rock the shoulder m willapproach the end of the trip-lever until it strikes' it andforces itback. This will cause the end of the rod G to slip from the curved endt' of the lever, and the rod will be forced down belouY the disk M bythe coil spring 1). The pawl d will then be free to engage with thebevel-gear P, and, as the latter revolves, the screw-shaft will turnwith it and lower the drill-frame a certain distance.

XVhile the shaft li is thus being revolved the end l of the projecting`arm N upon the rod G will strike the lowersurt'ace ot' the cam O uponthe sleeve S, and be gradually raised until tahe upper end of the rodstrikes the pawl d and tliscngagcs it from 4the bevel-gear P, and thelower end rises above the end i of the triplever sufliciently topermitit to be thrownback again by `the 'spring n. .'lhus the hevel-gearP is free tore- /volve with the pinion Q, except when therod G ispermitted to drop and release the pawl d, when the screw-shaft F andbevel-gear will turn together.

As the only connection between the collar L, secured upon the sleeveSfand the `collar K upon the 'screw-shaft F, is thepin G (iig. 2,)itfollows that when l.the pi is raised from thel recess in the collar Lthe bevel-gear will turn, but the shaftF will remain stationary, so thathy'raisintr the pin c during the operation of the machine, thefeed-motion of the drill will 'be arrested without interfering with theworking of the machine, as the mechanism operating the drill and thatturning the screw-shaft are entirely disconnected.

The feed motion of the drill is thus always under control, andinay bearrested or 'set in motion at any point by disconnect-ing the collar Kfrom the collar L, I,as before stated.

The end of the screw-shaft F is provided with a handle T, by which itcan be rotated when the pin c is raised in order to adjust thedrill-frame to any desired position.

As the drill-frame is fed downward by the screwsh aft the curved end ofthe trip-lever I is caused to drop at which point it remains stationaryuntil the-drill penetrates far enough into the rock to allow theshoulder an to strike it. It will thus be evident that the frequency ofthe operation of' the feed is governed by erating at shorterintervals-for soft rock and at longer ones for hard rock.

The stop J upon the stationary bracket D cani-be adjustedto stop thefeed and the penetratinofth-e drill at any desired point, by setting itin suchfpositio'n below the pin u on the rod G that, as the drill-'frameis fed downward, the piu u will, att-'he :proper time, catch upon thestop J and prevent the rod G from dropping down tore'leasel thepawld,-the feedbelng a certain distance below the shoulder m upon thedrill,

the penetration of the d rill into the rock, the feed op-.

set in motion at each time the rod G drops, is, in this' case,arrested'at the required time.. v

I am aware of the patent, No. 55,307, granted J nne 5, 1 S66,and.do notwish to be understood as claiming any part, device7 or thing thereinclaimed.

Claims.

Iclaim- 1v. The mechanism for automatically regulating the feed indrilling-machines, consisting of the rod G, with the arm N, and the camO, and the vibrating lever I, constructed and operating substantially inthe man` ner herein described and specilied.

